Central safety device



A. MOESSINGER 2,386,706

CENTRAL SAFETY DEVICE Filed March 15, 1943 l 2 Sheets-Sheet l W 9 if" I4 If 3 i; INVENTOR.

A L 5 ERTiV/EJESJ/NGER.

' ATTORNEY.

@cfi. 9, i945. Aj o ssm 2,386,706

CENTRAL SAFETY DEVICE Filed-March 15, 1945 2 Sheets-Shget 2 millINVENTOR. ALBERT Mass/Nate.

vBy hf Arrow/Ex Painted Oct. 9, 1945 PATENT OFFICE 2,386,706 CENTRALSAFETY DEVICE Albert Moessinger, Winter-thin, Switzerland, asslgnor toSulzer Frres, Societe Anonyme, Wintert-hur, Switzerland ApplicationMarch 15, 1943, Serial No. 479,232 In Switzerland April 1, 1942 8Claims.

In elements transmitting motion, especially in devices where the partsare not positively connected to each other, for instance in looms withordinary shuttles, it is possible that the working parts may becomeblocked through the inaccurate working of the shuttles, for instancecoming to rest in an undesired position. In order to avoid thepossibility of these parts becoming blocked, the elements areconstructed in a known manner so that the force in the direction of theendangered motion acts through a spring. In order, however, to obtainsufflcient accuracy in working, this spring force should not be greaterthan the greatest force acting on the driven part during normal working.This leads to unnecessary wear and too much power being required by themachine.

The invention I eliminates this drawback and consists in that a pivotpoint in an element transmitting motion is normally held stationary inits working position by a spring against a fixed stop, so that, when thedriven part of this element is for some reason or other unable anylonger to execute its motion, the normally stationary pivot point ismoved from its usual position by the further motion of the driven partof the element.

The motion of the pivot point normally held,

in a stationary position by springs, can act on the stopping .device ofthe machine through a it will be found preferable for the motions of thespring-supported pivot points to act on one and the same shaft extendingalong the machine and connected to the stopping motion of the machine.The spring-supported pivot points may move parallel to or normally totheplane of motion in case of a disturbance. I I

Various examples of executioner the subject matter or the invention areshown diagrammatically'in the drawings.

Figs. 1-4 represent safety devices for elements transmitting motion.

Fig. represents axonometrically a, central safety installation for aloom with ordinary shuttles.

Fig. 1 shows a shaft l driven by the machine, from which shaft a; motionhas tobe transmitted to the rod 2. An eccentric 3 is keyed on the shaftand is attached by the eccentric strap 5 to the connecting rod 4. Thisconnecting rod 4 is connected by the rocking lever or supportable member6 to the rod 2. The middle pivot pin 1 of the rocking lever 6 is fixedto a rod 8 which can slide axially in the bearings 9 and I0 rigidly con-10 the pivot 1.

nected to the fixed part of the machine. Members and 8 movably supportto supportable member 6. The rod 8 is provided with a collar or anabuttal II which is pressed against the 5 fixed bearing or stationaryabutment ID by the 9 action of the spring I2. As long as the machineworks free from trouble, the bearing pin 1 remains in the position shownin full lines and the lever B rocks about Should forany reason the rod 2be prevented from executing its motion, the lever 6 will be brought intothe position 6 (shown in chain-dotted lines) because of the furthermotion of theeccentric 3 and the connecting rod 4, the bearing pin 1 andthe rod 8 making a motion to the right until the bearing pin' comes intothe position I. The rod 8 presses on an actuating mechanism comprising alever l3 connected to the control shaft l4, which causes the 1 machineto stopwhen the lever comes into the the machine is keyed a cam H. Inthe cam curve l8 of the cam runs a roller l9 which is pivotallysupported on the end of the rocking lever 20. At the other end of thisrocking lever 20 the rod I5 is fixed. The middlepivot 2| of the rockinglever 20 is located in a rod 24 which is supported by bearings 22, 23connected to the stationary part of the machine.

The rod 24 has a thickened partg25 which is exactly as long as thebearing 23. By means of the spring plates 26 and 26', and the springs 21and 21 connected to the rod 24 by the spring plates 28, 28' and the pins29, 29', the rod 24 is held in a certain position. Thereby also thepivot points 2| of the rocking lever 20 have a certain definiteposition. If for any reason the rod It: cannot execute its otion, thepivot point of the rocking lever 20 will be able to move according tothe invention to the right or to the left by overcoming the force of thespring 21 or ZI'Qaccording to the direction in which the motion of therod I5 is prevented.

In the rod 24 is also a funnel-shaped recess 3'0 in which a ball 3|,which is movably held in a guide bush 32 connected to the fixed part ofthe machine, is pressed upwards bya rodf33,

a control lever 34 and a control shaft 35. When a the rod 24 is moved tothe right or to the left, the ball 3| is pressed downwards, thusinfluencing the control lever 35 together through the rod 33 andthelever 34.

Fig. 3 shows a safety device for a motion transmitted by toothed wheels.The motion is transmitted from the driving wheel 80 to the driven wheel8! through an intermediate wheel 82, whose axis 83 is supported on ashaft 85 carried in two fixed bearings 84'and 84'.

The rod 85 has, similarly to the arrangement shown in Fig. 1, a collar86 which ispressed onto the fixed bearing 84 by a springBl. Should forsome reason or other the driven wheel 8| not be able to make itsrotation,- the .point of rotation 83 of the intermediate wheel 82 willbe moved to the left against the action of the spring El because of thefurther movement of the driving toothed wheel 80, so that the machine isbrought to rest by the control shaft 58.

Fig. 4 illustrates a further example of execution according to theinvention, in which the motion is transmitted by helical toothed wheels.The axis of one of the two wheels 90 and Si is kept in position axiallyby two disks 92 and '32. These two disks are pressed onto a fixed stop93, 93' by means of springs 94 and 94', which stop is longer than thetoothed wheel 9! by the play required to ensure the machine runningcorrectly.

In normal service these disks 92, 92 are to be regarded as fixed disks.But if the torque to be transmitted should increase for any reasonbeyond a certain permissible value, the axial reactions caused by thehelical gearing become greater than the pressure exerted b the springs94, 94. The toothed wheel 9! and its axis 95 are moved axially, thuscausing the machine to stop'by influencing the linkage 96, 9'! and thecontrol shaft 98.

Fig. shows axonometrically a central safety installation for a loom withgripper shuttles. The shuttle 40 is brought to rest by brakes (not shownin the drawings) in its position shown in full lines. In this positionthe weft thread 4! inserted-by the shuttle is to be freed. For thispurpose a rod 42 is provided which is operated by the rocking lever 43,the connecting rod 44 and the eccentric 46 keyed to the driving shaft45. The rod 42 enters an opening 41 in the shuttle 40 and forces the twogripping cheeks of the thread gripper 48 apart. The weft thread 4| isthereby freed from the shuttle.

The pivot point 49 of the lever 43 is carried on a rod 52 which ismovable in the bearings 50 and 5| and can execute an axial movement. Therod 52 has a thickened part 53 which is exactly as long as the bearing5| and lies within that bearing. By means of the loose spring-plates 54-and the spring 55, which are connected to the rod 52 through the fixedspring-plate 56, the rod 52 is kept fixed in a certain position.

The device works in the same manner as already shown in Fig. 2. Througha displacement of the rod 52, the lever 51 is caused to make a slightmotion downwards and turn the shaft 58. If the shuttle 40 has notreached its proper position, for instance if it has not comesufliciently far into the brake, the opening 41 will no longer be in theproper position to allow the rod 42 to enter it. The rod 42 willtherefore hit against the body of the shuttle. But by the furthermovement of the connecting rod 44 and the looking of the rod 42, thepivot point 49 of the lever 43, and consequently the rod 52, will bemoved to the front, i. e. in the direction of the control shaft -58,whereby the lever 57 and the shaft 58 will be turned, thus stopping themachine.

If the shuttle 40 does not come into the brake at all, the extension 6!of the lever 59, which is pulled upwards by a spring 60 into the path ofthe shuttle, will come into the way of a hook 62 provided on the rod 42,thus preventing the rod 42 from moving towards the front. Because of thefurther motion of the connecting rod 44, which is driven by the drivingshaft 45, the pivot point 49 of the lever 44 is moved towards the rear,whereby also the lever 51 and the control shaft 58 are rotated and themachine is stopped. If on the other hand the shuttle has come into itsproper position, the point of the shuttle 40 presses against the lever59 and brings the extension 6! of the lever 59 beyond reach of hook 62.

On the driving shaft 45 two further eccentrics 63 are provided. Theseeccentrics drive two connecting rods 64, each of which is connected to alever 55. The lower pivot point 56 of the lever 55 is carried in a rod5i. This rod is movable in the bearing 68 and is pressed against thatbearing by the spring 59, so that the rod has a. definite position innormal service. This device works in the same manner as the one shown inFig. 1. By the motion of the connecting rod 54, the lever 65 moves therod 70 and/or II backwards and forwards. The rod 10 after the pickingtime enters a hole (not shown) in the shuttle. The shuttle 4D is shownin chain-dotted lines in that position.

If the shuttle 40' has not been picked because of incorrect Working ofthe machine, the rod 'Hl presses against the shuttle and its motion isthereby blocked. Through the further motion of the connecting rod 64 thepivot pointfifi of the lever 65 is moved against the force of the spring59, whereby the rod 51 rotates the lever 12 and the control shaft 58.

The rod H of the central part of the installation is designed as a weftstop motion. In the fixed bearings 73 a member I4 is pivotallysupported. This member carries a feeler needle 15 and a lever arm 76,the latter tending to rotate the member 14 by a spring 11. This rotationis hindered by the taut weft thread 4|. In this position the rod H canslide over the member '14 without hindrance. If the thread 4| breaks,the feeler needle can turn into the chain-dotted position shown, themember 14 being rotated under the influence of the spring 11. In thatposition the member 14 presents a surface in the path of the rod H, thusblocking its motion and the machine is consequently stopped in a similarmanner as for the needle 10.

Preferably all the safetydevices for the machine are constructed in sucha way that they can act on the same control shaft 58 installed alongsidethe machine. The control shaft 58 is connected to a stopping device ofthe loom which is not shown in the drawings. The elements whichconstitute this safety device may be made all of the same size foradopting in any case, so

that their manufacture is rendered inexpensive.

According to the invention the bearing pressures of the memberstransmitting the motion in normal service are the same, as in apositivelydriven system. But should any disturbance occur, the forcesthereby exerted are limited by the spring pressure of the yieldinglysupported pivot point of the moving element, thereby preventing anybreakage orother damage to the device.

I claim:

, A motion transmitting mechanism comprising a supportable member andmovable support means movably connected therewith, a stationary abutmentmeans slidably connected with said assavoe support means, an abuttalconnected with said support means and abutting said abutment means whensaid support means are in normal operating position, resilient meansinterposed between said abutment means and said support means andadapted to hold said support means in position whereby abutting relationbetween said abutment means and said abuttal and normal operatingposition of said support means are assured and adapted to yield to anabnormal pressure exerted by said supportable member on said movablesupport means whereby said support means are moved and said abuttal isremoved from said abutment gneans.

2. A motion transmitting mechanism comprising a supportable member, astationary abutment, a longitudinally movable, shaft-like support memberextending through said abutment and swingably supporting saidsupportable member, an abuttal on said shaft-like member on either sideof said abutment, and spring means disposed on either side of saidabutment and individually interposed therebetween and one of saidabuttals.

3. A mechanism as set forth in claim 1, comprising an actuatingmechanism in operative relation with said movable support means andadapted to be operated upon movement of said support means.

4. A mechanism comprising a plurality of motion transmitting mechanismsof the type set forth in claim 1, and an actuating mechanism havingmembers individually adjacent to and in operative relation with themovable support means of saidmotion transmitting mechanisms, saidactuating mechanism being operated upon movement of any one of saidsupport means.

5. A motion transmitting mechanism comprising a supportable memberhaving a fulcrum, a longitudinally displaceable longitudinal supportmember swingably connected with said supportable member at its fulcrum,yielding means connected with and holding said support member and saidfulcrum in normal operating position, and actuating means movablyconnected with said support member and being actuated by a longitudinalmovement thereof and displacement of said fulcrum against the action ofsaid yielding means.

6. A motion transmitting mechanism comprisin in combination, a pluralityof supportable members and a plurality of longitudinally displaceablelongitudinal support members individually movably connected therewith,yielding means connected with and individually holding said supportmembers in normal operating position, and a plurality of abutmentmembers individually abuttingly engaging said individual support membersand being adapted to be individually actuated by a longitudinal movementof an individual support member against the action of the yielding meanspertaining thereto, and an actuating means connected with all of saidabutment members and being actuated upon movement of any one of them.

7. A motion transmitting mechanism as set forth in claim 5, saidactuating means having a portion moving, when actuated, substantiall inthe same direction as said longitudinal movement.

8. A motion transmitting mechanism as set torth in claim 5, saidactuating means having a part moving, when actuated, substantially at aas right angle with respect to the direction of said longitudinalmovement.

ALBERT Moassmasa.

